Purple Math has about 100 lessons covering virtually every topic in standard high school and college algebra classes. The site is divided into beginning, intermediate, and advanced levels, and a separate section is included for word problems. Purple Math excels in its use of examples; for each topic there are plenty of illustrative problems with clearly defined solutions. In addition to being an...

Math Power is a site created by Professor Freedman, a highly acclaimed teacher of basic mathematics. She has several resources to help students of all ages learn pre-algebra and elementary algebra skills. Many sample homework assignments are provided, as well as general study tips and a list of "ten ways to reduce math anxiety." A collection of video clips demonstrate specific math concepts. There...

Designed and maintained by Elizabeth Stapel, an educator and holder of an advanced degree in mathematics, Purplemath contains hundreds of lessons designed to help students who might be having trouble with algebra. As Stapel notes on the site’s homepage, “These lessons emphasize the practicalities rather than the technicalities, demonstrating dependable techniques, warning of likely “trick”...

Funded by the National Science Foundation and collaboratively curated by the University of Colorado, Oregon State University, Duke University, Colorado School of Mines, and Worcester Polytechnic Institute, Teach Engineering is a "searchable, web-based digital library collection populated with standards-based engineering curricula for use by K-12 teachers and engineering faculty to make applied...

The Matrix Market website, provided by the National Institute of Standards and Technology, is "a visual repository of test data for use in comparative studies of algorithms for numerical linear algebra." The repository includes about 500 sparse matrices from a variety of applications, along with matrix generation tools and services. Visitors can scan the top ten or browse the repository by...

An instructor at Boise State University offers his book on elementary algebra for middle school, high school, and college students. The book spans nine chapters and covers both pre-algebra and algebra topics. Clear explanations of polynomials, systems of equations, and exponential expressions are just a few concepts addressed in the book. A particularly useful chapter provides some suggestions for...